National oil and gas firm PTT Plc will allow the National Anti-Corruption Commission (NACC) to examine the company's internal investigation into the latest Rolls-Royce bribery case to promote transparency, says president and chief executive Tevin Vongvanich.
The move is the latest response to the US Justice Department's allegations that PTT officials accepted bribes to buy Rolls-Royce engines.
PTT and Thai Airways International were both mentioned in regard to the case last week.
PTT has set up an internal investigative committee consisting of company members who have never been involved in procurement or auction processes in order to ensure transparency.
The results of the investigation will be finalised within a month.
Mr Tevin said the PTT board has suggested the company allow the NACC to join the investigation and take a role in the company's procurement to contribute to a more transparent process.
Furthermore, middlemen or sales representatives and all agents will be registered with the company before joining the procurement process, allowing actions to be traced accurately.
Mr Tevin said the new measures and regulations are expected to be finalised soon and will be applied at the auction of PTT's fifth gas pipeline development project, which is due to open for bidding this year. The project is worth an estimated 92 billion baht.
The gas pipeline project was designed to link gas supply between the eastern and western regions and help avert disruptions at gas blocks in the Gulf of Thailand while maintenance is taking place.
The development of the second unit of the liquefied natural gas (LNG) receiving terminal, worth 23 billion baht, is due to be auctioned in the second half of the year.
PTT is one of 50 firms that joined the Anti-Corruption Organization of Thailand (ACT) in June 2011.
Last year, PTT applied ACT's model of transparent procurement by inviting members selected by ACT to monitor the auction process for gas pipeline compressor units in Ayutthaya's Wang Noi district.
According to PTT's report, over the next five years, PTT and its subsidiaries will set aside nearly 900 billion baht for capital expenditure towards business expansion.
Two new units, PTT Oil and Retail Co and Global Green Plc, are due to be spun off for listing on the Stock Exchange of Thailand.